Extending the GMR Current Measurement Range with a Counteracting Magnetic Field

Poon, Tin Yan; Tse, Norman C. F.; Lau, Ricky Wing Hong

doi:10.3390/s130608042

Cited by 31 publications

(18 citation statements)

References 24 publications

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“…Moreover, in terms of performance comparison of the implemented sensor setup with other solutions on the market, we can note the following: The novelty of our approach consists in using a double differential measurement system, Figure 11, based on commercial GMR sensors, with an adjustable biasing system used to linearize the field response of the system. This approach was not seen in other works [14,[30][31][32] or was implemented in commercial sensors like microfluxgate [4,5] or based on AMR effect [7][8][9]. As we are using a movable permanent magnet to bias the sensors and there is no compensation coil, the power consumption of our detection system (DAQ card and PC is not included) is very small, of about 6.4 mW (as each sensor has a power consumption of 3.2 mW, as noted in [18]).…”

Section: Resultsmentioning

confidence: 85%

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

Musuroi

Oproiu

Volmer

et al. 2020

Sensors

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This paper presents the design and implementation of a high sensitivity giant magnetoresistance (GMR) based current sensor with a broad range of applications. The novelty of our approach consists in using a double differential measurement system, based on commercial GMR sensors, with an adjustable biasing system used to linearize the field response of the system. The work aims to act as a fully-operational proof of concept application, with an emphasis on the mode of operation and methods to improve the sensitivity and linearity of the measurement system. The implemented system has a broad current measurement range from as low as 75 mA in DC and 150 mA in AC up to 4 A by using a single setup. The sensor system is also very low power, consuming only 6.4 mW. Due to the way the sensors are polarized and positioned above the U-shaped conductive band through which the current to be measured is flowing, the differential setup offers a sensitivity of about between 0.0272 to 0.0307 V/A (signal from sensors with no amplifications), a high immunity to external magnetic fields, low hysteresis effects of 40 mA, and a temperature drift of the offset of about −2.59×10−4 A/°C. The system provides a high flexibility in designing applications where local fields with very low amplitudes must be detected. This setup can be redesigned for a wide range of applications, thus allowing further specific optimizations, which would provide an even greater accuracy and a significantly extended operation range.

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Section: Resultsmentioning

confidence: 85%

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

Musuroi

Oproiu

Volmer

et al. 2020

Sensors

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“…Solid-state magnetic sensors based on Giant Magneto-Resistance (GMR) has been integrated in eddy current probes that are capable of addressing these difficult problem s. Because of their superior sensitivity. Small dimensions and low cost, these sensors have been proved effective for detection of deeply buried cracks (up to 25 mm below the surface) using eddy current methods [18,19].…”

Section: Giant Magneto-resistancementioning

confidence: 99%

Construct Coil Probe Using GMR Sensor for Eddy Current Testing

et al. 2018

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Eddy current testing is a widely applied non-destructive technique in different sections of industries. Nowadays eddy current testing is an accurate, widely used and well-understood inspection technique, particularly in the aircraft and nuclear industries. The main purpose of this paper is to construct an eddy current probe by using transmission coil and using a Giant Magneto resistance (GMR) sensor for detection medium. This probe only use a magnetic field to operational in detection of flaws. A transmission coil is an object made from a material that is magnetized and creates its own persistent magnetic field. A GMR-coil probe has been used to inspect two different material of calibration block. Experimental results obtained by scanning A GMR-coil probe over Brass calibration block has 10 slots with different depth from 0.5mm to 5mm and mild steel has 8 slots with different depth from 0.5mm to 4mm are presented. The result prove that GMR-coil probe that operated using a magnetic field and sensor more effective on ferromagnetic material.

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“…With respect to the first category, efforts and attempts include the closed-loop operation [20], the design of counteracting magnetic field [21], the low-frequency capture [22], and the automatic calibration and adjustment [23]. However, most of these special designs are in effect complicated, expensive, and energy-consuming, which makes them unfavorable for wireless sensor network and lowpower sensing applications.…”

Section: Introductionmentioning

confidence: 99%

Hysteretic Modeling of Output Characteristics of Giant Magnetoresistive Current Sensors

Han

Ouyang

et al. 2015

IEEE Trans. Ind. Electron.

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Current sensing based on the giant magnetoresistance (GMR) effect has been gaining attention due to its outstanding merits. In this paper, hysteretic models of the output characteristics of GMR sensors are presented, and corresponding algorithms are successfully applied to practical GMR sensors to compensate for measurement error due to hysteresis, which is particularly important for high-frequency applications. A 91% decrease in nonlinear error is achieved by the proposed advanced hysteretic model, and the applicable frequency range of the GMR sensor can be extended to around the cutoff frequency of sensor hardware, which is nearly 50 times larger than that based on the conventional linear models. This paper provides optimized solutions for GMR current sensors in different frequency ranges.

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Extending the GMR Current Measurement Range with a Counteracting Magnetic Field

Cited by 31 publications

References 24 publications

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

High Sensitivity Differential Giant Magnetoresistance (GMR) Based Sensor for Non-Contacting DC/AC Current Measurement

Construct Coil Probe Using GMR Sensor for Eddy Current Testing

Hysteretic Modeling of Output Characteristics of Giant Magnetoresistive Current Sensors

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